598 FiLiCES. (ferns.) 



or rather scythe-shaped. — N. New England to Wisconsin, cliiefly in mountain 

 woods, and northward. (Eu.) ^ 



Var. Bo6ttii. Frond elongated-oblong or elongated-lanceolate in outline; 

 pinnules broadly oblong, very obtuse, the lower pinnatifid, the upper and smaller 

 merely serrate ; indasium minutely glandular. (A. Boottii, Tuckerm. Dryop- 

 teris rigida, ed. I ; not Aspidium rigidum, Sumrtz.) — E. Massachusetts, Boott, 

 &c. Co»necticut, D. G. Eaton, and northward. — The least dissected fonn, iiv- 

 termediate in appearance between A. epinulosum and A. cristatum, but passing 

 into the former. 



■1- -1- Frond once pinnate, and the pinncB deeply pinnatifid, or at the base nearly twice 

 pinnate : fruit-dots within the margin, large ; the indusium thinnish and flat. 



4. A. cristatuni; Swartz. Frond linear-oblong or lanceolate in outline 

 m° to 2J° long and very long-stalked) ; pinnce short (2' -3'), triangular-oblong, 

 or the lowest nearly triangular-ovate, from a somewhat heart-shaped base, acute, 

 deeply pinnatifid ; the divisions (8 - 13 pairs) oblong, very obtuse, finely serrate or 

 cut-toothed, the lowest pinnatifid-lobed ; fruit-dots as near the midrib as the margin, 

 often confluent. (A. I.ancastriense, Swartz.) — Swamps, &c. ; common. July. 

 — Stalk bearing broad and deciduous chaify scales. (Eu.) 



5. A. Ooldiamiin, Hook. Frond broadly ovale, or the fertile ovate- 

 oblong in outline (2° - 3° long), short-stalked ; pinnae (6' - 9' long) oblong-lan- 

 ceolate, pinnately parted; the divisions (about 20 pairs) oUong4inear, slightly 

 scythe-shaped, obtuse (1' long), sen-ate with appressed teeth, bearing the distinct 

 fruit-dots nearer the midrib than the margin (these smaller than in No. 4). — Rich 

 and moist woods, from Connecticut to Kentucky, and northward. Sept. — A 

 stately species, often 4° high ; the fronds decaying in autumn. Indusium often 

 orbicular without a distinct sinus, as in Polystichum. 



-I- -i- -1- Fronds {thickish and mostly persistent through the winter, as in Poly- 

 stichum), twice pinnate, but the nearly entire upper pinnules confluent, some of 

 the lower pinnatifld-toothed : fruit-dots close to the margin ; the indusium thickish 

 and tumid. 



6. A. mai'g^iilale, Swartz. Frond ovatc-oblong in outline (1°- 2° long), 

 pale green ; pinnee lanceolate from a broad almost sessile base ; pinnules ob- 

 long, obtuse, crowded. — Eocky hill-sides in rich woods; common, especially 

 northward. July. 



§ 2. POLYSTICHUM, Both. — Indusium orbicular and entire, peltate, {or rarely 

 round-kidney-shaped in the same species, as in No. 7,) flxed by the depressed centre : 

 fronds rigid and coriaceous, evergreen, very chaffy on the rhachis, Sfc. : the pinna 

 or pinnules auricled at the base on the upper side, crowded, the teeth or lobes bristle- 

 tipped. 



* Fronds twice pinnate or nearly so. 



7. A. fragrans, Swartz. Fronds (4' -9' \u^\\) glandular and aromatic, 

 pinnate, with the linear-oblong pinnae pinnately parted ; their crowded divisions 

 (2" long) oblong, obtuse, covered with the fruit-dots, the rusty-brown great in- 

 dusia nearly equalling them in breadth; rhachis, &c. chaffy with very largo 

 scales. — Shaded trap-rocks, Falls of the St. Croix, Wisconsin, Dr. Parry, and 

 high northward. 



